Very Slow ADSL Broadband - Cambridge

[jb5768]

For the past week my BB has been intolerably slow. 
Today pinging ee.co.uk:
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Ping statistics for 45.60.72.23:
Packets: Sent = 100, Received = 90, Lost = 10 (10% loss),
Approximate round trip times in milli-seconds:
Minimum = 555ms, Maximum = 3538ms, Average = 2625ms

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That's an average of 2.5 seconds! Similar results pinging BBC, Yahoo, Google, etc. 
I'm Ethernet-tied to the BrightBox1 router, so WiFi is not the issue. 
If I tracert ee.co.uk (Win10) :

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Tracing route to ee.co.uk [45.60.72.23]
over a maximum of 30 hops:

1 1 ms 1 ms 1 ms BrightBox.ee [192.168.1.1]
2 3494 ms 3343 ms 3496 ms 172.16.15.28
3 * * * Request timed out.
4 * 3447 ms 2620 ms 213.121.98.128
5 3464 ms 3323 ms 2561 ms 87.237.20.130
6 * 3376 ms 2085 ms 195.66.226.47
7 * 2466 ms 1710 ms 45.60.72.23

Trace complete.

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Router says:

System Uptime is: 02:15:56

Current Time/Date is: 15:28:07 29 Oct

I tried the thinkbroadband.com speed test, but it eventually fails with "Error Code: 4134 (Suspect download behaviour)". 
I'm based in the center of Cambridge (the recommended samknows.com link to determine the exchange is now Cisco). 
Checked the sockets and power cycled the router multiple times. 284kbps downstream....sigh 😞
The Line Atten looks high? ..but the SNR is also very high. 
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Are there known issues at the moment?
Is this likely to be more of a DNS style issue, as opposed to a HW issue? 

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Only managed to upload one image, gave up trying to upload other images. Pressed the Post button at 15:35

[XRaySpeX]

Locate the hidden test socket that is revealed when you remove the bottom half of the split faceplate (2 screws or press tabs) of your master socket. Only do this if you have a split faceplate. Do you have any extension sockets in the home even if unused? Are there any wires connected to back of faceplate of master socket?

Try the BT Quiet Line Test (QLT), dial 17070 Opt 2, preferably with a corded phone, in the test socket with the router disconnected. If there is any noise, report it to your landline provider as a voice fault (don't mention Broadband). Often sorting out voice faults will fix the Broadband as well.

Reboot the router & plug it into the test socket. Post the full router stats & System Uptime when plugged into test socket.

Is the issue any better?

[jb5768]

Those DSL results were with a rebooted modem ("System Uptime is: 02:15:56") and plugged into the "test" socket. Don't have a phone to plug in, unfortunately, and there are no extensions. 
 

[XRaySpeX]

You should be syncing at about 17 Meg instead of the 283 K that you are. The reason you are not is that the DLM system has put you on a banded profile in response to past errors on your line, at the top of the lowest of these ADSL Banded Profiles, altho' you now have no significant errors. You need to give the DLM time to relent & remove any banding. Leave it alone for at least 7 days & don't reset or resync the router. If it's still banded you should then call EE to get the DLM reset in order to remove any banding. However should significant errors persist the DLM will reapply banding.

[XRaySpeX]

W/out a landline phone you'll never find out whether this fault is due to your internal wiring & therefore the fixing of it chargeable or not.

The QLT is the most important test to help diagnose faults such as yours. Noise on the line is the most common cause of BB failing or going slow.

A corded phone handset is the best diagnostic tool you can have for BB. I strongly recommend getting a cheap corded handset to help diagnose BB issues like yours as well as keeping the line "wet" to help avoiding BB issues & paying out for an engineer to fix faults in your own wiring.